DANIEL MCCARTHY's Discussions

Does anybody have advise to a way to weed through inconsistent shots? Our field crew goes out on Monday, shoots elevations on control stations set 10 years ago, (that have been checked-out to have…Read more →

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"RTK solutions are typically only good to about 0.1' vertically, thats why you're seeing so much of a difference. A rapid static solution at least 16m long (for OPUS processing) or conventional methods are your best bet"

"The Carlson program you refer to, is it Carlson SurvCE?
If so, set one receiver to collect static data internally to a memory card as a Static Base. Set the Rover as for RTK but don't connect to the base with UHF..fudge the RTK connection....As…"

"Thank you for the reply, we have a Carlson program and are currently trying to figure out how to use the static collection mode in it. I used the old system we have for static collection and it does seem more accurate than the RTK collection. The…"

"Thank you for the reply, we have a Carlson program and are currently trying to figure out how to use the static collection mode in it. I used the old system we have for static collection and it does seem more accurate than the RTK collection. The…"

"Did you create a Geod for the project?
Which did you localize on? Or did you use the base point?
RTK is usually centimeter accuracy (horizontal)
vertical is usually considered 3 X horizontal error
I would cook static for 30 min and send to OPUS "

Does anybody have advise to a way to weed through inconsistent shots? Our field crew goes out on Monday, shoots elevations on control stations set 10 years ago, (that have been checked-out to have good NAVD88 elevations. They take 50 shots on each station using RTK, come in with the info and one might be within a few hundredths, the other may be 0.10' high, the last one might be 0.26' high. A week later, go back to the same control stations, again, take 50 shots on each one and be a tenth on…See More

"...a passing point, if you are using VRS, check the distance to the virtual reference point each time you make these checks...if there is a variable here you cannot expect consistency...as has been said in other replies the length of the vectors…"

"One quick response, Gary....then I'm off to go to sleep. Several years ago, I performed a retracement survey by myself...rugged and timbered, along township and range lines, sections 35 and 36. I used GPS one morning and had just set up the…"

"Dear Mr. CcCarthy,
The published misfit of the Geoid12B model is 1.71 cm StDev (1sigma) nationwide. (It may be worse locally.)1.71 cm = 0.06ft.You don't indicate if your RTK is local or an RTN. I would expect a good RTM to be more consistent…"

"Those differences in elevations (0.10' +/-) are consistent with RTK. If you want consistence, set a pair of points with the RTK, then observe all the critical points with a Robot, or conventional instrument. These results will…"